LAKE KEECHELUS, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(454414) LAKE KEECHELUS
From Year=1907 To Year=1977
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1201	1010	985	774	573	346	177	172	338	617	898	1103	8196
60	1046	869	830	625	421	212	79	77	205	463	748	948	6523
57	953	784	737	535	333	144	42	40	138	371	658	855	5591
55	891	728	675	476	277	105	24	24	101	312	598	793	5004
50	736	586	520	329	152	35	4	4	36	176	448	638	3666

Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. This is done for each day of the month and summed.
Table updated on Oct 31, 2012
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered

Western Regional Climate Center, wrcc@dri.edu